Preparation of copper powder by glycerol process

Sinha, Amit; Sharma, B.P.

doi:10.1016/s0025-5408(01)00819-4

Cited by 81 publications

(50 citation statements)

References 3 publications

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“…Since all the diffrac- tograms are almost identical, only two samples are shown ( Figure 2). Very narrow diffraction peaks indicate relatively large crystallite sizes, and crystallite sizes -calculated by the Scherrer equation [46] (Table 1), agree well with particle sizes from SEM micrographs, indicating that ZnO particles, synthesized in the presence of p-TsOH, are highly crystalline. When ZnO was prepared in TEG without p-TsOH by the same procedure as described above (Figure 1e), particles of submicrometer size were obtained.…”

Section: Results and Discussion 31 Synthesis Of Nano Znosupporting

confidence: 69%

Polyol mediated nano size zinc oxide and nanocomposites with poly(methyl methacrylate)

Anžlovar¹,

Kogej²,

Orel³

et al. 2011

Express Polym. Lett.

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Abstract. Organophilic nano ZnO particles have been synthesized in various diols (ethylene glycol -EG, 1,2 propane diol -PD, 1,4 butane diol -BD and tetra(ethylene glycol) -TEG) in the presence of p-toluenesulfonic acid, p-TsOH, as an end capping agent. The addition of p-TsOH reduces the ZnO particle size and increases its crystallite size. With increasing diol main chain length the ZnO particle size increases (EG (32 nm) < PD (33 nm) < BD (72 nm) < TEG (86 nm)). Using the assynthesized and unmodified ZnO nanocomposites with poly(methyl methacrylate), PMMA, matrix have been prepared by the in-situ bulk polymerization of methyl methacrylate, MMA. The addition of surface modifiers is avoided which is an advantage for the application since they can influence other properties of the material. ZnO particles, especially those with smaller particle sizes (EG -32 nm, PD -33 nm) showed enhanced effect on the thermal stability of PMMA, ultraviolet, UV, absorption and transparency for visible light. Transparent materials with high UV absorption and with enhanced resistance to sunlight were obtained by optimizing the nanocomposite preparation procedure using ZnO particles of about 30 nm size in concentrations between 0.05 and 0.1 wt%. The reported nanocomposite preparation procedure is compatible with the industrial process of PMMA sheet production.

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Section: Results and Discussion 31 Synthesis Of Nano Znosupporting

confidence: 69%

Polyol mediated nano size zinc oxide and nanocomposites with poly(methyl methacrylate)

Anžlovar¹,

Kogej²,

Orel³

et al. 2011

Express Polym. Lett.

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“…Recently, copper powders have been used in wide variety of fields, for examples, paints to make a non-metal materials with metallic-like surface, coatings preventing wear and corrosion, catalysts as well as conductive materials in electronic appliances, especially in form of paste for using in the main component of printed circuit board, multi-layer ceramic capacitors and hybrid integrated circuits [1][2][3]. Nowadays, copper powders are increasingly brought in those mentioned works instead of noble metal such as Ag, Au and Pt due to rapid price increase of precious metals.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Ultrafine Copper Powders with Controllable Size via Polyol Process with Sodium Hydroxide Addition

Chokratanasombat

Nisaratanaporn

2012

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Abstract.A facile polyol process for producing copper powders with controllable size is described here. The copper powders have been readily synthesized by the reduction of copper (II) nitrate trihydrate with the solution of glycerol and sodium hydroxide. The X-ray diffraction, SEM and FESEM were used to characterize the obtained copper powders. The effect of the concentration of NaOH and the reaction temperature were investigated. The sizes and the complete reaction time of the copper powders were decreased at the condition of increasing the concentration of NaOH and the reaction temperature. For example, at the constant reaction temperature of 140 °C, the sizes of the obtained powders of the molar ratio of NaOH:Cu(NO3)2 range from 2:1 to 5:1 were decreased from 1.40 to 0.10 µm as well as the complete reaction times which were reduced from 240 to 17 minutes, respectively. By controlling the process parameters the uniform nano-sized copper powders could be achieved at the optimal condition.

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“…Cu powders have been extensively studied as fillers for conductive pastes in touch panel and solar cell industries because of their low resistance and material cost [1][2][3]. However, pure Cu powders gradually oxidize in air at room temperature [4][5][6][7] and the oxidation accelerates with increasing temperature [8,9]; thus, the fabrication and application of Ag-coated Cu (Cu@Ag) powders to suppress the surface oxidation of Cu powders has recently attracted more attention [4][5][6][7][8]10,11].…”

Section: Introductionmentioning

confidence: 99%

Effects Of Process Parameters On Cu Powder Synthesis Yield And Particle Size In A Wet-Chemical Process

Shin¹,

Lee²

2015

Archives of Metallurgy and Materials

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This study presents a simple wet-chemical process to prepare several micron-size Cu powders. Moreover, changes in powder synthesis yield and particle size are examined with different solvents, synthesis temperatures, and amounts of reducing agent during the synthesis. As a reducing agent and capping agent, L-ascorbic acid and polyvinyl pyrrolidone were used, respectively. The yields in distilled water or an ethylene glycol (EG)/distilled water mixture were higher than that in EG alone, and the yield increased with increasing temperature owing to a lower ∆ Gred value. Increasing the L-ascorbic acid concentration also increased the yield. The Cu powder synthesized in 3 h at 90• C in distilled water with 272.8 mM of L-ascorbic acid showed the lowest average particle size of 2.52 µm, indicating mechanisms of short burst nucleation and reduced growth via the increased reduction rate of Cu ions. It is estimated that the nucleation step was nearly completed within 10 min in this system. The Cu powders synthesized in an ethylene glycol/distilled water mixture presented an average particle size of 3.76 µm and the highest yield of 87.9%.

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Preparation of copper powder by glycerol process

Cited by 81 publications

References 3 publications

Polyol mediated nano size zinc oxide and nanocomposites with poly(methyl methacrylate)

Polyol mediated nano size zinc oxide and nanocomposites with poly(methyl methacrylate)

Preparation of Ultrafine Copper Powders with Controllable Size via Polyol Process with Sodium Hydroxide Addition

Effects Of Process Parameters On Cu Powder Synthesis Yield And Particle Size In A Wet-Chemical Process

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